Doxygen fixes.

src/Magnum/Context.h

@@ -227,8 +227,7 @@ class MAGNUM_EXPORT Context {
         /**
          * @brief OpenGL version
          *
-         * @see @ref majorVersion(), @ref minorVersion(), @ref versionString(),
+         * @see @ref versionString(), @ref shadingLanguageVersionString()
-         *      @ref shadingLanguageVersionString()
          */
         Version version() const { return _version; }
 

src/Magnum/SceneGraph/AbstractObject.h

@@ -255,7 +255,7 @@ template<UnsignedInt dimensions, class T> class AbstractObject
          * calls @ref setClean() on every parent which is not already clean. If
          * the object is already clean, the function does nothing.
          *
-         * See also @ref setClean(const std::vector<AbstractObject<dimensions, T>*>&),
+         * See also @ref setClean(const std::vector<std::reference_wrapper<AbstractObject<dimensions, T>>>&),
          * which cleans given set of objects more efficiently than when calling
          * @ref setClean() on each object individually.
          * @see @ref scenegraph-features-caching, @ref setDirty(),

src/Magnum/Version.h

@@ -39,7 +39,7 @@ namespace Magnum {
 /**
 @brief OpenGL version
 
-@see @ref Context, @ref MAGNUM_ASSERT_VERSION_SUPPORTED()
+@see @ref version(), @ref Context, @ref MAGNUM_ASSERT_VERSION_SUPPORTED()
 */
 enum class Version: Int {
     None = 0xFFFF,                  /**< @brief Unspecified */